EDM or Electronic Distance Measures do precisely what you will look forward to – measure distance. Simply like laser levels, this is performed with the assistance of a high powered laser. These devices send the laser to pre-placed prisms at the target site. The prism sends the laser beam back to the device. Through measuring how long the laser beam took to come back, the tool is capable of accurately measuring the distance between the prism and device. EDMs are very valuable for any project that needs extremely precise measuring of distances.